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Effects of chlorpromazine on serotonin uptake in blood platelets
Psychiatry Research
|May 1, 1983
Abstract:
Platelet serotonin (5-HT) uptake was studied in schizophrenic patients before and after treatment with chlorpromazine (CPZ) for 2-3 weeks. No difference was noted in the affinity of 5-HT (Km) or maximum velocity of 5-HT uptake (Vmax) of unmedicated schizophrenic patients and normal controls. Administration of CPZ was associated with a significant increase in Km and Vmax. Specific uptake of 5-HT, at 0.5 microM, was significantly decreased in most subjects. Chlorpromazine inhibited 5-HT uptake into platelets from normal controls in vitro (IC50, 1.8 +/- 0.1 microM) in a competitive manner.